Rainbow Electronics MAX17117 - Manual

_______________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Internal-Switch Boost Regulator with Integrated
7-Channel Scan Driver, Op Amp, and LDO MAX17117
General Description
The MAX17117 includes a high-performance step-up
regulator, a 350mA low-dropout (LDO) linear regulator,
a high-speed operational amplifier, and a high-voltage
level-shifting scan driver with gate-shading control. The
device is optimized for thin-film transistor (TFT) liquid-
crystal display (LCD) applications.
The step-up DC-DC converter provides the regulated
supply voltage for panel source-driver ICs. The high
1.2MHz switching frequency allows the use of ultra-small
inductors and ceramic capacitors. The current-mode
control architecture provides a fast-transient response to
pulsed loads typical of source driver loads. The step-up
regulator features an adjustable soft-start and an adjust-
able cycle-by-cycle current limit.
The high-current operational amplifier is designed to
drive the LCD backplane (VCOM). The amplifier features
high output current (Q200mA typ), fast slew rate (40V/Fs
typ), wide bandwidth (16MHz typ), and rail-to-rail inputs
and outputs.
The low-voltage LDO linear regulator has an integrated
0.8I pass element and can provide at least 350mA. The
output voltage is accurate within Q1%.
The high-voltage, level-shifting scan driver with gate-
shading control is designed to drive the TFT panel gate
drivers. Its seven outputs swing 40V (maximum) between
+35V (maximum) and -15V (minimum) and can swiftly
drive capacitive loads.
The MAX17117 is available in a 32-pin, 5mm x 5mm, thin
QFN package with a maximum thickness of 0.8mm for
thin LCD panels.
Applications
Notebook Computer Displays
Features
S
2.3V to 5.5V IN Supply-Voltage Range
S
1.2MHz Current-Mode Step-Up Regulator
Fast-Transient Response
High-Accuracy Reference (1%)
Integrated 16V, 2A, 200mI MOSFET
High Efficiency (> 85%)
Adjustable Cycle-by-Cycle Current Limit
S
High-Performance Operational Amplifier
200mA Output Short-Circuit Current
40V/µs Slew Rate
16MHz, -3dB Bandwidth
Low-Dropout Linear Regulator
High-Accuracy Output Voltage (1.0%)
S
High-Voltage Drivers with Scan Logic
+35V to -15V Outputs
40V Maximum Voltage Swing
Gate-Shading Control
S
Thermal-Overload Protection
S
32-Pin, 5mm x 5mm, Thin QFN Package
19-5241; Rev 0; 4/10
Simplified Operating Circuit
Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
EVALUATION KIT
AVAILABLE
SYSTEM
PANEL
V VGL
V VGL
V MAIN
V GHON
TO VCOM
BACKPLANE
SCAN DRIVER AND
GATE-SHADING
CONTROL LOGIC
V IN
V LOGIC
ENA
LDOADJ
LDOO
DTS
GHON
V GHON
ST
CK1
CK3
CK5
CK2
CK4
CK6
VGL
IN
S6
S4
S2
S5
S3
S1
LINEAR
REGULATOR
SETUP
CONTROLLER
GATE-
SHADING
TIMING
CONTROL
MAX17117
LX
PGND
FB
COMP
SS
AGND
(EP)
OPAS
OUT
POS
OP
STH
CKH1
CKH3
CKH5
RO
CKH2
CKH4
CKH6
RE
VGLC
PART TEMP RANGE PIN-PACKAGE
MAX17117ETJ+ -40NC to +85NC 32 TQFN-EP*